I will say, though, that the BBC iPlayer-Castbridge setup is extremely vulnerable to network traffic. If I have it running, and my wi-fi connected cell phone rings or gets a notification, the whole thing falls over. I'll grant that my network probably has a lot more stuff going on than most so maybe it's just me.

I suspect it's something more to do with the Googles. I have noticed internet disconnects since the googles were added to my network. Goodness knows what the Google presence is actually doing on a network ...

Yes, but I already can get Spotify by yelling at the minis, telling them to cast it to the Mondo Plus or Encore Plus. I can use the Spotify phone and tablet apps to cast it to the chromecasts so it will play on the powered speakers or use Spotify Connect to listen to it on the receivers. So that seems like quite enough ways to get the ubiquitous Spotify and adding it to LMS would be a little superfluous. It is nice to know, though, that LMS has such an active cadre of developers.

Also, unless Grace Digital has given up, Spotify Connect is supposed to show up on the Mondo and Encore Plus, which is yet another way of getting Spotify.